A close-up look reveals dedication to the time period in history with detailed embroidery and lamé.
"She wanted Edith's dress to be the most beautiful dress because when there's the scene of the rejection at the altar," he said.

"The Costumes of Downton Abbey" exhibit will also contrast the American country estate, using DuPont family heirlooms, with the British country estate.

Winterthur is expecting 100,000 visitors in the nearly year-long exhibit that closes in January 2015. Many of them will be fans of the show as it fuels America's ongoing fascination with British culture.

"We love the royal family, you know, we couldn't get enough of the royal wedding, the birth of the baby, it's just this ongoing kind of love affair," Groff said.